ValueError:不允许负尺寸(HOG)

Question

我正在用下面的代码实现HOG(定向梯度直方图)。

import io
from skimage.io import imread, imshow
from skimage.feature import hog
from skimage import exposure
from skimage import io
import matplotlib

img = imread('cr7.jpeg')

io.imshow(img)
MC = True #Fpr color images
#MC = false #for grayscale images

hogfv, hog_image = hog(img, orientations=9,
    pixels_per_cell=(32,32),
    cells_per_block=(4,4),
    visualize = True ,
    channel_axis=MC)
hog_image_rescaled = exposure.rescale_intensity(hog_image, in_range=(0,5))
imshow(hog_image_rescaled)

我不知道为什么会有维数误差。

Traceback (most recent call last):
  File "main.py", line 22, in <module>
    channel_axis=MC)
  File "/Volumes/DATA/Djangoproject/HOG/env/lib/python3.7/site-packages/skimage/_shared/utils.py", line 427, in fixed_func
    out = func(*new_args, **kwargs)
  File "/Volumes/DATA/Djangoproject/HOG/env/lib/python3.7/site-packages/skimage/_shared/utils.py", line 348, in fixed_func
    return func(*args, **kwargs)
  File "/Volumes/DATA/Djangoproject/HOG/env/lib/python3.7/site-packages/skimage/feature/_hog.py", line 286, in hog
    dtype=float_dtype
ValueError: negative dimensions are not allowed
(base) (env) c100-110@C100-110s-iMac-2 HOG % python main.py
Traceback (most recent call last):
  File "main.py", line 18, in <module>
    channel_axis=MC)
  File "/Volumes/DATA/Djangoproject/HOG/env/lib/python3.7/site-packages/skimage/_shared/utils.py", line 427, in fixed_func
    out = func(*new_args, **kwargs)
  File "/Volumes/DATA/Djangoproject/HOG/env/lib/python3.7/site-packages/skimage/_shared/utils.py", line 348, in fixed_func
    return func(*args, **kwargs)
  File "/Volumes/DATA/Djangoproject/HOG/env/lib/python3.7/site-packages/skimage/feature/_hog.py", line 286, in hog
    dtype=float_dtype
ValueError: negative dimensions are not allowed

有人能帮我找到这个错误的解决方案吗。

Answer 1

错误日志显示“第22行”有一个问题。

Traceback (most recent call last):
  File "main.py", line 22, in <module>
    channel_axis=MC)
...
ValueError: negative dimensions are not allowed

channel_axis，这是“通道轴”！所以我猜它需要一个整数，而不是bool值。

这是在源代码中确认的

channel_axis : int或None，可选 如果没有，则假定图像是灰度(单通道)图像。否则，此参数指示数组的哪个轴对应于通道。

我想你是想用multichannel，这是不可取的

多通道:布尔，可选 如果为真，则将最后一个image维度视为颜色通道，否则为空间维度。这个参数是不可取的:改为指定channel_axis。